How did you place the images onto your pages at first?
If you dragged-and-dropped them there, then they really ought to be in your Project file. You can discover this by doing as follows:
1 - for safety’s sake make a copy of the Project file in question by right-single-clicking on it in the Finder and selecting ‘Duplicate’, then (re)naming that copy in a way that’s useful/memorable… ‘SAFE_RW6_Project’, or similar; you would later revert to this if things ever went wrong
2 - now single-right-click on the original Project file in the Finder and select ‘Show Package Contents’
3 - open the Pages directory there
4 - navigate to a subdirectory (in that Pages directory) which corresponds to a page for which you know you should have images. Such subdirectories of this ‘Pages’ folder will be entitled ‘nn-name’, where '‘nn’ is a (2-digit) number, ‘01’, ‘02’, ‘03’, ‘04’ etc and ‘name’ is the name of your page, which will be either ‘page1’, ‘page2’, ‘page3’, ‘page4’ or - if you renamed them in the RW6 Inspector such names as ‘home’, ‘contact’, ‘about’ etc
5 - in a page’s folder, you’ll see another subfolder, ‘Data’; open that
6 - do you see files with names which you won’t recognize, but extensions which you will - hopefully .jpg, .png etc. Those are your graphics files on their pages.
Do you see them?
One reason that images may not show up is that you have moved either their originals/sources in the Finder when you have deployed them using RW’s Resources; or you have moved your Project file to another computer which does not have the images on it, or at least not in the same place under those circumstances.
Did you use RW’s Resources to manage images?
Did you do anything else to your RW version, your Stacks installation or your Project file between the last time it worked and today?
Did you also export your project locally?
As a test, can you temporarily make a new page in a new, ‘dummy’, RW project and deploy graphics there?